Oscillator



Feb. 2s, 1929. 1,703,664

A.. C. FRIEDEL OSCILLATOR Filed Sept. 4, 1926 2 Sheets-Sheet l @am w u AORNEY.

Feb. 26, 1929. 1,703,664

A. c. FRIEDr-:L

:oscILLAToR Filed Sept. 4, 1926 2 Sheets-Sheet 2 alum Uf/444 g4 Y ATTORNEY Patented Feb. 26, 1929.

UNITED STATES ignarat PATENT OFFICE.

ARTHUR C. FRIEDEL, OF SYRACUSE, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS,

i' TO WILLIAM W. VARNEY, OF BALTIMORE, MARYLAND.

OSCILLATR.

Application filed September 4, 1926. Serial No. 133,557.

The object of my invention is the providing of an improved oscillator or acoustic vibrator.

A further object of my invention is the pro.- viding of an improved oscillator or acoustic vibrator of the portable type provided with lmeans of folding so that the same maybe carried flat andformed into a curved position when in use.

A further object of my invention is the pro viding of an improved means of folding a portable oscillator or acoustic vibrator whereby the portions near the folds may assume substantially the same curvature as other parts of the oscillator when in use.

A 'further object of my invention is the providing of an improved collapsible cone oscillator, having means of substantially forming the same into a cone and the securing thereof for use.

Oscillators or acoustic vibrators, the subject of this specification are especially adapted for phonograpliic and loud speaker uses and are equally well adapted for reception or reproduction. The means provided for accomplishing the objects of this inven tion are equally applicable for forming what is known as a megaphone7 Where portability may be had in fiat form.

Vith the foregoing and other objects in view, my invention consists ot the novel construction, con'ibination and arrangement of parts as hereinafter specifically described and illustrated in the accompanying drawings wherein shown the preferred embodiment of my invention, but it is understood that changes, variations and modih'eations may be resorted to which come within the scope of the claims hereunto appended.

In the drawings 'of the herein described embodiment of my invention Figure l is a plan view of the oscillator unformed or opened out and in flat forni, and ready to be curved and secured in position to :form a cone; Figure 2 is -a sectional view taken through 2 2 of Figure 1, looking in the direction of the arrows and shows the fold formed by creasing one'side, allowing the other side to be intac to provide a tension when curved, thus curving its adjacent portions. Figure 3 is a view in elevation of the oscillator formed into the conical shape, ready for use. Figure 4 is a sectional view taken through 4-4 of Figure 3, looking in the direction of the arrows, and Fig. 5 is a view of my oscillator `folded flat for transportation and Fig. 6` is a sectional view taken through 5-5 of Fig. l.

Similar numerals refer to similar parts throughout the several views.

`In this spccilication when I use the term cone, I mean conical formed body, strictly speaking technically a truncated cone,but as 1t is so near a cone and when in use with its securing means el its opera ting` mechanism is substantially a cone, consequently I term the formed body aA cone. The cone or body l is formed out of flexible material of any suitable character. I have found what is known in the trade as cover stock, highly calendered suitable for this purpose.

2 is a securing flap, preferably made of the same material and glued or otherwise secured to cone or body l as shown in Figures l and 4. 3 is a securing means or as I might describe it a double eyelet, secured to body l and dlap 2. A singleeyelet attached to either one of said members forming a knob willV work, but I prefer the double eyelet, providing a slight space between members l and 2 for the insertion of the free edge 5r to body 1. et is a slot or slit in the periphery of l near its free edge 5". I have found that varnishing the vicinity of this slot 4L adds durability to this member. 6 and 7 are one-way folds or creases. These folds are made in the same direction from the center portion of member l, the free edge folding under lirst, then the edge with the iap il'olding under next. This gives me a limit ot' i'old when spread out iu opener flat position, and when formed into the conical shape is formed against these folds so as to give a continuous circular section within said cone, the folds being formed against. the fold and in tension. llrhen forming the cone after having unfolded body l into lat position forming the cone against, the folds as above suggested is continued until free edge 5 enters between i'iap 2 and body l, said edge being slightly out ot position along the element or cone having been slipped towards the center to permit slot i to pass eyelet 3. 'Vhcn the two edges of the body l are substantially in contact, free edge is slipped out and slot i is thus slipped around eyelet 3, subst-antially locking the periphery of the cone. The cone is now formed and secured in operating position for attaching to a. phonograph or other appliance upon which it is to work.

This is usually accomplished by a securing or clamping means at the apex of cone.

, When the free edges of the cone are in contact and the slot 4 out in locked position around eyelet 3 the portion of the free edges between the center and securing Hap 2 are prevented from being in contact, which if in contact might cause vibration or noise by touching, edge "5 is cut back slightly as shown at 9, thus preventing contact at this portion of the free edges.

'At 'the center an opening or hole 8 is provided7 through which a bolt may penetrate for the securing means which forms no part of this invention-and is not further described.

Having vthus described my invention, what I claim and desire to secure by Letters Patent is: i

1. A collapsible. conical sound reproducing diaphragm comprising an integral strucformed of a flexible material, onev face of said material being provided with creases along certain lines of the exterior thereof to permit folding.

3. A collapsible conical sound reproducing diaphragm comprising a body provided with free edges along an element thereof and means for locking said free edges consisting of a slot in one of the edges and a knob in another edge in juxtaposition with said slot and against which said slot engages.

4. A conical sound reproducing diaphragm, one edge of which is provided with a Hap whereby the other edge may be engaged and means for securing said other edge between said iiap and a free edge.

5. A sound reproducing diaphragm, one edge of which is provided with a iiap Whereby the other edge maybe engaged and means for securing said other edge between said flap and a free edge, and means for preventing contact in unsecured portions of the said free edges.

4ARTHUR o. FRIEDEL. 

